Method of grinding



Sept 13, 1932- J. H. MACARTNEY 1,877,517

METHOD OF GRINDING Filed Dec. 15. 195o 2 Sheeheet 1 IN VEN TOR.

ley/mym- A TTORNEY Sept 13, 1932- J. H. MACARTNEY METHOD op GRINDING Filed Dec. 15. 1950 ZSheetS-Sheet 2 T s a INV EN TOR.

ATTORNEY Patented Sept. 13, 1932 UNITED STATESA PATENT OFI-ice .JOHN II. MACARTNEY, oIsAN FRANCISCO, CALIFORNIA, AssIGNoR, :BY amsNE-i'issIcfN-y MENTS, To TURBO-MILL COMPANY, LTD., A CORPORATION OF CALIFORNIA METHOD 0F GRINDING- Application med December 15,1930. ser'i-ai No. 502,282.

This invention relates to apparatusfor andmethod of grinding, and is particularly adapted to the art of comminution, reduction, trituration and levigation, and includes apparatus and method adapted to reduction of loose and broken lumpy material, such as ores, cement, rock, clay and the like,.to a required fineness of mesh.

Objects of the invention are to provide an apparatus wherein the bodies forming an ag- L glomerate may be reduced or disintegrated by interimpaction of portions of the agglomerate with other portions thereof, while subj ecting the agglomerate to the eifectof centrifugal force; tb provide a grinding apparatus wherein the attrition of agglomerate is accomplished without wear and tear on parts of the apparatus, and wherein the agglomerate is prevented from jamming; .to provide for drawing of the triturated particles simultaneously with and separately from extruded particles of larger mesh; to provide meansv whereby the mesh of extruded particles may be varied; to provide a method of grinding or i reducing agglomerate wherein attrition is accomplished in the presence of centrifugal force and simultaneously causing within the agglomerate aV diametric movement radially relative to the direction of the `centrifuga-l force. f Y AV;

This application relates to and isan` 1inprovement of the disclosure andl subjectmatter of United States Letters Patent No. 1,441,- 162, in which I am joint inventor.

The present invention provides improvements of apparatus and method whereiniinely triturated particles are simultaneouslyrremoved from the apparatus separately 4from the pulverized particles of larger mesh; to provide an apparatus and method'wherein bodies of relatively oppositely rotatedfand,k

relatively oscillated .bodies of agglomerate are subjected to centrifugal force with the faces of the respective bodies in grinding contact and providing a continuous feed of new With the above mentioned and other obj ects -1 in view, the invention consists in the nove1- `which slide with the carriage andrhavev ani' construction and combination of parts hereinafter described, illustrated in the accompanying drawings and kpointed out in the claims hereto appended; it being understood that vvarious changes in the form, proportion, size and minor details of construction within the scope of the claims may be resorted to f without departing from the spirit or sacrificing any of the advantages of the invention. To more clearly comprehend the invention, reference is directed to the accompanying drawings, wherein l Fig. 1 is a vertical longitudinal transverse section on line`1-1 of Fig. 3.

Fig. 2 is a vertical lateral transverse section on line 2-2.of Fig. 1.

Fig. 3 is a vertical end view of the apparatus.

Referring to the drawings in which like characters of Y reference designate corresponding parts, 4 indicates, generally, a base frame of usual and well-known type and preferably which has a base 5 with vertical side walls 7 and end walls 8 with a top plate 9 which provide a chamber l0. within whichA operating,mechanism may be conveniently"4 arranged. v v

The frame may be bolted to abase or bed by any suitable means, such as spikes for bolts, through bosses.11 of the frame.V The .upper-1 so side of the top plate is provided with tracksU 12 at its opposite ends upon which carriages 13 are reciprocably slidable on runners 13, the carriages 13 being lockable atany position relative to lthe tracks by lock bolts 14-.-

endengaged within a slot 15in the top plate. The slidable adjustment of the carriages is accomplishedl by y suitable reciprocation means, such ashand wheels 16 which Ahaveymf threaded shafts 17 engaging complementary threaded portions 1S of the carriages. Each carriage mounts upon suitable support ,19p a housingy 20 and rwithin the housing is *rotat-v ably inounted a tubular shaft 21 which is pro-395 vided'with oppositely inclinedk conical roller bearings 22, and each of the shafts 21 mounts a pulley 23 keyed to the shaft by any. suitable means, as by screw'24, and being rotatively actuated from any suitable power sources byasioc Y ably axially horizontallydisposed, and having opposing relatively "spaced open ends provided with peripheral flanges 26 upon which are removably mount-ed wearing shoes or plates 27, as by threaded bolts 28, the 'outer' ta ered wall of the containers being provided with helically arranged lins 29. Y

Intermediate the opposing o pen spaced ends'of the containers 25 is a central segment 3() of the drum A (best shown in Fig. l), s

which is rotatable independently of the containe'rs25, being vertically supported on rotatable trunnions 3l which are grooved as at 32 to receive a circumferential runner 33a which extends radially from the outer surface of segment 30. The segment30 is preferably arcuatev on its inner Vaxially longitudinal face 33 and is provided at its circumferential edges with flanges 34 extended radially outward, said flanges mounting, by bolts 36,

wearing shoes or plates y35, which are opposed t o the slices or plates 27 ofthe containers 25, and normally spaced a desired distance therefrom, as at 58, 5.9. The segment 30 is rotated oppositely and independently of the containers 25, and preferably at less rev olutions per minute, and receives its rotation from the trunnions 3l, one of which is keyed or otherwise fixedly lsecured to rotatable shaft 37 Vdriven from a suitable power source belt pulley 38, and preferably from the same power source which actuates the pulleys Y 23. A belt or chain connects the second trunnion and thereby rotates same in the same direction as the driven trunnion; this form of drive beinghpreferred since the second trunnion is rotatably mounted in a Yhopper. and tube 63 are preferred to be reframe 40 which has one end pivotally mounted on shaft 37, as at 4l, and has its other end 42 extending beyond the periphery of the second trunnion and thereat mounts a roller 43, which bears against a roller cam 44 which Vis mounted on and rotated by shaft 45v which is rotated from any suitable source, either 46 which have grooves therein adapted tore-` ceive the runner 33a.

rlhe'rollers 46 have springgtension bearing againstrunner 33a,

and are mounted onv a shaft'47 in a yoke 48 which liascoil spring 49, the tension of which is regulated by 'manually operated handv through wheels V50 which operate threaded shafts 50a mounted on guide members 51, which in turn are mounted .at openings 52 in the arcuate portion of an inverted U-shaped frame 53 which foots on base frame 10, as at 54, and is secured thereto by bolts 55. The U-shaped frame extends arcuately over and is spaced from the outer wall of the drum A radial of the axis thereof.

Mounted on the frame 53, as by bolts 54,

'is housing 55a which substantially encases theidrum A and is provided with openings 56 in its side walls, and through which the rotatable shafts 2lV extend. The housing has an inwardly extending circular ring plate 57 having a flange outward at one end mounted on the bolts 54 and a eircumferential portion extending between the inner side ofthe U-shaped frame and the flanges 26 and 34, and having at its other end a radially inward flange which stops adjacent the outer wall of the segment 30 providing an opening 60and thus substantially enclosing within housings the respective openings 58 and 59 which pulverized agglomerate passes in the manner hereafter described.

The housings 55a are provided, preferably at or near their bottom portions, with exhaust ducts or tubes 61 which lead to a proper bin or receptacle for the attritus.

Continuous feed means are provided, consisting of a hopper 62 into which agglomerate is received from a source of supply, not

shown, and a feed tube 63, preferably stationary, extends from the bottom of the hopper through one of the tubular rotatable Vshafts 2l, and having an end opening into one end of the drumA.

Disposed axially within the tube 63, and

thereb'eyond through the hopper, is a helical y spiral conveyer 64 which is mounted on and Yrotates with a shaft 65 which has suitable bearing fin a wall of the hopper, as at 66, and

Vmay beY further .journalled in a support 67, and mounts suitable means, whereby said i shaft may be rotated, such as pulley 68. The

movably mounted Von the housing 20, as by bolts 69a, so that the spiral conveyer may be inserted or removed for repair or replace# ment. A Y

' At the end of the drum A, opposite the feed end, is provided an exhaust tube 69 Yfor minutely-triturated material to the free end of }wh ilch is attached a suitable suction tube 70. `The tube 69 is preferably stationary and is mounted axially within and spaced from the inner walls of the rotatable tube 2l, as at 74, by means of a plate 71 secured by bolts 72 to the outer end face ofthe housing 20.` Within plate-7l' are provided holes/7 Sthrough which air may 'pass inwardly to the drum through the space 74, A Y

If-desired, more rigi'dlyand positively to directtheivertical voscillation of the end 4:2

Mode of operation.

Assuming a proper power source and belt, chain or other suitable land usual means of transferring power to the pulleys 23, 38 and 68, trunnions 31 and shaft 45, the shafts 21 are rigidly rotated, preferably from the same power source simultaneously in the same direction of rotation which may be either clockwise or counter-clockwise, thereby axially rotating the extreme drum section containers 25. Likewise the shaft 37 is rotated through pulley 68 and thereby rotates the trunnions 31 which support and thereby axially rotate the intermediate drum section 30, the rotation of which is in the opposite direction of rotation relative to the sections 25, but preferably at a slower rate of rotation. It has been found satisfactory and efficient for practical purposes, if the extreme sections be rotated approximately 1100 R. P. M. and the intermediate section be rotated 600 R. P. M. though these ratios may be materially varied according to the material being ground, and the time in which it is desired to grind it. This rotation will cause the material B within the sections 25 of the drum to be revolved in the same directionwith those sections, and the material C to be revolved in counter-direction in the intermediate section 30, the faces B and C being maintained in contacted grinding relation by the centrifugal force set up by the said rotation, which is restrained by the peripheral walls of the drum.

Simultaneously with the rotation of the intermediate section 30, the shaft is rotated which actuates cam 44 and thereby oscillates end 42 of frame 40 which through trunnions 31 vertically oscillates intermediate section 30 of drum A with relation to the extreme sections 25, which oscillation continually changes the contacting grinding faces of the agglomerate relative to each other, prevents jamming of the material and continually agitates the contacting agglomerate so that the triturated, decomposed-or pulverized particles E of a desired mesh are enabled to work through the mass of agglomerate and are thrown radially outward through the openings 58, 59 into a chamber within the housing and is blown from said chamber through outlet tube 61, by suitable blower means, such as ins 29, or by any suitable suction device operating from an outside source. The oscillation of the intermediate section 3()y also distributes evenly the wear on plates 27 and 35. The openings 58 and 59 may be regulated to various desired sizes of mesh by hand wheels 16 which have threaded engagement with carriages 13, which reciprocate the eXtreme sections 25 by means of shafts 2'1 mounted on the carriages.

In the course of the grinding operation, a mass of very fine particles F are formed of much smaller mesh than the particles E thrown out throughthe openings 58, 59 and it is of very considerable practical value to have these ner particles segregated from the larger particles exhausted from openings 61. Therefore, a suction means of any suitable type is connected to the tube 69 and these liner particles sucked from the axially central portion of the drum. To prevent any possibility of the suction through tube 69 from counteracting the centrifugal force of the revolved masses B and C 0r the suction of the exhaust tube 61, there is provided an air inlet at holes or ports 73 to the drum through the space 7 4 which opens adjacent the inner opening of tube 69.

It is preferred to have agglomerate continuously fed to the drum, which is accomplished by a continuous supply from a suitable source (not shown) in to the hopper 62, and thereafter propelled by the helical spiral 64 through the tube 63 and into the drum, preferably axially thereof, the newly fed material falling by gravity to the lower portion of the revolving agglomerate mass and being fed thereacross axially of the drum by the centrifugal force which is operative by reason of the revolving agglomerate, an angle of slippage D being maintained at approximately 300 to a perpendicular to the axis of the drum, the several bodies of'agglomerate grinding on opposing contacting faces thereof with substantially no wear on the parts of the device.

What I claim and desire to secure by United States Letters Patent is The method of grinding lumpy material which compri-ses the steps of subjecting two masses of said material to the action of'centrifugal force by revolving them in the same direction and interposing another mass of lumpy material intermediate the first mentioned masses and with faces in contact therewith, restraining said material in such manner that each of said masses forms a separate continuous grinding surface, said masses being so placed that their grinding surface cooperate to grind the contacting material therebetween and subjecting said intermediate mass to centrifugal force by revolving same in the opposite direction to the first mentioned two masses.

In testimony whereof I have affixed my signature.

JOHN I-I. MAC'ARTNE-Y. 

